When is the best time to dive Rio de Janeiro Maru?

The typical diving season is December to April. Conditions vary year to year, so confirm locally before booking.

Federated States of Micronesia · Truk Lagoon

Rio de Janeiro Maru

Q: Is Rio de Janeiro Maru good for snorkelling?

Yes - snorkelling is viable here. Marginal - shallowest structure at ~9-10m is at the outer edge of snorkel feasibility but generally considered a scuba site, not a snorkel site

Best time to dive

December to April

Certification & difficulty

Technical

Snorkelling

Snorkel-friendly - Marginal - shallowest structure at ~9-10m is at the outer edge of snorkel feasibility but generally considered a scuba site, not a snorkel site

Safety notes

Bow section structurally weakened from wartime fire and internal ammunition explosions; sharp debris and unstable sections in cargo holds; silt-out risk in engine room; short no-decompression time at max depth (roughly 14-20 minutes on air); unexploded ordnance from stored ammunition; war grave - treat with respect

Permits & fees

Chuuk State dive permit reported ~$50/year (per Blue Lagoon Dive Shop rates page) - confirm current fee locally

Permits and operators change - confirm before booking.

Location

Nearest hub: Weno (Chuuk)

This profile is desk research, compiled from public sources - not a first-hand dive report. Coordinates are approximate.